yeah if u get the seio go with the 820's and i would get 2 of them
i have a 100G tank and i have a seio 1500 along with a rio hyper flow 10 (660gph) and another power head froget brand but puts out about 400gph then all my returns and such im pushing about 2500+ gph
the seio works good but just becaureful i lost my 2 and a half year old white ribbon eel to it!!!
sucks in its tail into the inlet slits then sucked him around it and wouldnt release him by the time i found him it was too late!!!